feat(task): cancel active background command during task abort (cline#7363)

Add cleanup logic to cancel any active background command when aborting a task. This ensures background processes are properly terminated before the task abort completes, preventing orphaned background commands.

Author: arafatkatze

src/core/task/index.ts

@@ -1358,6 +1358,14 @@ export class Task {
 				}
 			}
 
+			if (this.activeBackgroundCommand) {
+				try {
+					await this.cancelBackgroundCommand()
+				} catch (error) {
+					Logger.error("Failed to cancel background command during task abort", error)
+				}
+			}
+
 			// PHASE 4: Run TaskCancel hook
 			// This allows the hook UI to appear in the webview
 			// Use the shouldRunTaskCancelHook value we captured in Phase 1